Hot-air heater



Patented Nov.. 27, 1923.

lJNlTQSTTES laissa aries.

ALBERT C. PYLE AND T01-IN F. BREWER, GF SEATTLE, 'WASHINGTUN.

HOT-AIR HEATER.

Application filed October 3, 1822. Serial No. 592,104.

To all 'ao/7mm t may concern: y

Be it known that we, ALBERT C. PYLE and Jenn F. BREWER, citizens of the United States, residing at Seattle, county of King, and State of 'Washingtom have invented a new and useful Hot-Air Heater; and we do hereby declare that the following is a full, clear, and exact specification, such as will enable others skilled in the art to which it appertains to make and use the same.

l he invention is a heater with passages in it for causing the gases from the fire to pass back and forth and down and up, which heater and passages are completely surrounded by a casing from which air ducts may be taken.

The object of the invention is to provide a heater that will extract practically all of the heat units from the gases of a ire which is constructed so that it willbe absolutely impossible for the gases to escape into a chamber surrounding it.

Another object of the invention is to provide a heater with suitable passages in it for extracting practically all of the heat units from the gases of the fire and which is constructed so that it will be impossible for the gases to escape to a chamber surrounding it; which is of a simple and economical construction.

lith these ends in view the invention embodies a rectangular shaped heater having the fire `box which is lined with fire brick in the center, air passages around the iire boX, a damper in the upper part of the yrear end and a casing surrounding the box and passages.

Other features and advantages of the inY vention will appear from the following description taken Vin connection with the` drawings, wherein Figure 1 is a longitudinal section on the center line of the heater.

Figure 2 is a cross section on line 2-2 of Figure 1.

Figure Figure 1.

ln the drawings we have shown our device as it would appear wherein numeral 1 indicates the re boX, numeral 2 the grate and numeral 3 the ash pit.

The ash pit is constructed in the center of the bottom of the shell 4 which is constructed of a plate bent in the shape of a semicircle at its center which forms the top of the fire box and having its ends extending down- 3 is a cross section on line 3-3 of ward in vertical planes and riveted and welded to a bottom plate 5. A; plate 6 is riveted and welded inthe end of the shell and this has an opening Tthiough it to which the flue is connected. @n the inside of the shell and at a short distance from the plate 6 is another plate S which also has an opening 9 in it to correspond with the opening 7 in the plate G.. This plate is not as wide as the plate 6 and as it is placed `in the center of the shell it will leave perpendicular openings 1() on each side. .fi kdamper 11 is hinged in the hole 9 and has a rod 12 projecting from it to which a lever lfis at-` tached which extends through the front of theouter casingglllfso thatit maybe oper ated by hand. rllhe outer casing extends completely around the shell and is constructed so that pipes or ducts may be attached to it in order to carry heat from the heater to any desired locations. rlhe fire box is lined with fire brick 15 on the sides and 16 at the rear end and at the top of the lire brick at the sides are horizontal partitions 16 which extend from the front of the shell to the plate 8 thus causing gases from the 'lire to pass backward through the passages 17 to the rear of the shell. Between the partitions 16 and the bottom of the shell are other horizontal partitions 18 which extend from the rear end of the shell forward to a point 19 which leaves openings at the front end of tlieheater for gases to pass downward from the chambers 2O formed between thc partishell in order to clean the chambers 2O and f 21. It will be seen that plates 25 may be placed between the chambers 21 and 22 and the fire box and ash pit and these plates will extend from the front of the shell to the plate 8, and legs 26 may be placed at the corners of the shell to leave an air space under it.

It will be understood that changes may be made in the construction without departing from the spirit of the invention. One of which changes may be in the shape of the shell, another may be in the number of chambers 2O and 21 used and still another may be in the location of the clean out doors 24.

The construction will be readily understood from the foregoing description. To use the device it may be assembled as shown and as the fire is started the damper may be opened until it is burning and then as the damper is closed the gases will pass upward as indicated by the arrows 27 and then baclrward and downward through the chambers 17 as indicated by the arrow 28. They then pass forward through the chambers 2O as indicated by the arrow 29 and then downward into the 'chambers 2l as indicated by the arrow 30 and backward as indicated by the arrow 31 to the rear of the shell at which point the gases from each side come together in the center and pass upward through the chamber 32 as indicated by the arrow 33 and into the flue as indicated by the arrow 34. It will be seen that as all of thejoints of the shell are both riveted and welded it will be impossible for the gases to escape into the chamber surrounding it and also as the gases are forced to pass back and forth practically all of the heat units will be extracted from them before they reach the flue opening.

Having thus fully described the invention what we claim as new and desire to secure by Letters Patent3 is A heater having a rectangular lire-box, a grate for burning either wood or coal, an ash pit under the grate, an ash door in the front of the pit, a tire door above the grate, fire brick lining at the sides and rear of the fireboX, air passages in the sides ot the fire-box and ash pit, a central air passage at the rear leading io a flue at the top, a damper in the front of the air passage at the rear, legs supporting the fire-box and air passages so that an air space will be left under them; said nre-box and air passages having their walls constructed of sheet metal and their outer `ioints riveted and welded; and a chamber surrounding the lire-box and air passages with an opening in the rear through which a flue may be connected to the rear air passage and' fire-box.

ALBERT C. PYLE. J. F. BREWER. 

